Mathematics, 22.07.2020 01:01 AriesTwice

Tensile strength tests were performed on two different grades of aluminum spars used in manufacturing the wing of a commercial transport aircraft. From past experience with the spar manufacturing process and the testing procedure, the standard deviations of tensile strengths are assumed to be known. The data obtained are as follows: n_1 = 10
x_1 = 87.6
σ_1 = 1
n_2 = 12
x^2 = 74.5
σ_2 = 1.5.

Required:
If μ _1 and μ _2 denote the true mean tensile strengths for the two grades of spars. Construct a 90 percentage confidence interval on the difference in mean strength.

Answers: 2

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 17:00, nicolemaefahey

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Answers: 1

continue

Mathematics, 21.06.2019 21:50, kaylaamberd

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

Answers: 2

continue

Mathematics, 21.06.2019 23:00, Ellafrederick

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.

Answers: 2

continue

Mathematics, 22.06.2019 00:10, iwannabewinston

Which of the following expressions cannot be simplified to x – 2?

Answers: 1

continue

You know the right answer?

Tensile strength tests were performed on two different grades of aluminum spars used in manufacturin...